When you say "small" do you just mean that the overall market for that coin is small, or the block size is small, etc? But I have been really impressed with monero's structure and community, I have been researching a little on it and so far so good on my end. I'd just have to see it get closer to $1 for me to start wanting to invest in it.
I meant that in terms of market size, community size, and project size (the latter referring to number of developers and others working on it).
The blocksize in all of them is dynamic (grows as needed, shrinks when not needed). Boolberry and AEON both have some pruning features (sightly different from each other).